Spence Wolf at Cupertino Bike Shop usually always substituted Weinmann brake levers instead of the Mafacs on drop-bar bikes.

The Mafacs levers pull a lot of cable, but they also require a large hand and a lot of hand stremf. Maybe Sonny Lisston would have liked them ?

I'm not sure about later Mafac levers with the full gum hoods - maybe they changed the leverage ?